backup old installation during install of a new version.

Won't it be a good feature to have litespeed webserver backupping the previous version during upgrade?
So in the upgrade there are questions asked if you like to save/backup the old version, just in case.

Perhaps you can enter an amount of days to keep the old install of litespeed and after these days have past it will be purged.

Why? Because there might be a bug which can't be fixed soon enough and you like to return to your old version. You can return then back by running a script?